The team discover the brutally murdered body of a man in the same cellar that the businessman was held hostage in. While investigating the two victims, the team find an unlikely suspect. They're positive of his connection to the murders, but need to collect the evidence to prove it.

Recap

Dr. Nick Henderson: We've all had days like that, haven't we? You make one small mistake and because of that you make a bigger one. You leave your wallet by the bed and you go up to get it, you trip over the rug, you break your leg. Next thing you know, you're in hospital with a fatal infection. Just because you forgot your wallet.Grace: Talking about yourself?Dr. Nick Henderson: No. Talking about weather systems.